Using xsi:type for traversing the derivation hierarchy

Hi,

If I define a list of built-in types, such as an integer, are there derivation relations between the list and integer, for example:

<simpleType name='listOfFloat'>

  <list itemType='float'/>

</simpleType>

Are there derivation relationships between listOfFloat and float?

Can I write the following XML instance?

<listOfFloat xsi:type=”float”>4.5</listOfFloat>

Regards,

Eran